简单的凸缘卷边接合已被应用于类似的产品，GT避震口在生产过程中用四层结构进行凸缘卷边接合处理。
Simple Wulstumlage joint technology has been used in the similar products. GT flexible duct connector use four layers to join the Wulstumlage in its production process.
简单的凸缘卷边接合已被应用于类似的产品，GT避震口在生产过程中用四层结构进行凸缘卷边接合处理。
Simple Wulstumlage joint technology has been used in the similar products. GT flexible duct connector use four layers to join the Wulstumlage in its production process.
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